EIGRP-2(EIGRP的路由认证)

EIGRP-2 EIGRP 的路由认证)
一、实验目的:
EIGRP 的路由认证
二、网络拓朴:
             
三、实验步骤:
              1 .环境搭建:
!---R1
enable
conf t
ho R1
no ip do lo
line con 0
logg s
no exec-t
int lo0
ip add 172.16.1.1 255.255.255.0
int s1/1
ip add 10.1.1 .1 255.255.255.0
no shut
exit
 
!---R2
enable
conf t
ho R2
no ip do lo
line con 0
logg s
no exec-t
int lo0
ip add 172.16.2.1 255.255.255.0
int s1/0
ip add 10.1.1 .2 255.255.255.0
no shut
exit
 
 
             2 .起用 EIGRP
!---R1
conf t
router eigrp 50
network 172.16.1.0
network 10.1.1 .0
no auto
exit
 
!---R2
conf t
router eigrp 50
network 172.16.2.0
network 10.1.1 .0
no auto
exit
              此时 R1 R2 成功建立邻居,并且两个 loopback 口互通。
             
              3 .起用认证,配置如下:
!---R1
conf t
key chain my
key 1
key-string cisco
exit
exit
 
int s1/1
ip authentication mode eigrp 50 md5
ip authentication key-chain eigrp 50 my
exit
当我们对 R1 进行了认证只后,这时会发现邻居 R2 会丢失,因为我们还没有在 R2 上配置相对应的认证,这种情况下, R1 R2 将不能建立邻居关系。
    *Jan  9 21:51:10.251: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 50: Neighbor 10.1.1 .2 (Serial1/1) is down: authentication mode changed
    R1#show ip eigrp neighbors
IP-EIGRP neighbors for process 50
 
然而,当我们在 R2 上对 EIGRP 进行和 R1 上匹配的认证之后, R1 R2 的邻居关系将会重新建立:
    R2#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R2(config)#key chain my
R2(config-keychain)#key 1
R2(config-keychain-key)#key-string cisco
R2(config-keychain-key)#exit
R2(config-keychain)#exit
R2(config)#
R2(config)#int s1/0
R2(config-if)#ip authentication mode eigrp 50 md5
R2(config-if)#ip authentication key-chain eigrp 50 my
R2(config-if)#exit
R2(config)#
*Jan  9 21:59:23.283: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 50: Neighbor 10.1.1 .1 (Serial1/0) is up: new adjacency
R1#show ip eigrp neighbors
IP-EIGRP neighbors for process 50
H  Address  Interface  Hold Uptime  SRTT  RTO  Q  Seq
                        (sec)      (ms)        Cnt Num
0  10.1.1 .2   Se1/1      12 00:02:33 1254  5000    0   7  

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